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Katsuta Group
- Sedimentary facies: Terrestrial, Shallow marine
- Thickness: ca. 300 m
- Lower limit: Unconformity
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Okayama pref.
- Fossils: Echinoids (Linthia? sp.), Fish scales, Crabs (Callianassa? sp.), Brachiopods, Corals, Foraminifera (Operculina complanata japonica), Pipe rocks
- Fossils (Shellfishes): Acila submirabilis, Anadara setoensis, Apolymetis sp., Arca sp., Azorinus sp., Batillaria cf. tateiwai, Batillaria cf. yamanarii, Cardium ogurai, Cardium tokunagai, Cerithidea tokunagai, Cerithiopsis sp., Chicoreus tiganouranus, Chlamys kotorai, Clava meisensis, Clementia papyracea, Conchocele disjuncta, Conus sp., Corbicula sp., Corbis sp., Crassatellites cf. nanus, Cyclina japonica, Dentalium sp., Dosinia suketoensis, Fabulina cf. nitidula, Felaniella ferruginata, Johannisiella takeyamai, Lima? sp., Limopsis sp., Lucina yokoyamai, Lucinoma kamenooensis, Macoma tokyoensis, Malletia inermis, Meretrix arugai, Moerella cf. jedoensis, Mytilus sp., Nassarius simizui, Nucula sp., Olivella sp., Ostrea gravitesta, Panomya? sp., Panope cf. japonica, Pecten? sp., Phaxas izumoensis, Portlandia sp., Propeamussium tateiwai, Saccella confusa, Saccella kongiensis, Serripes? sp., Solen sp., Soletellina minoensis, Terebra sp., Thyasira? sp., Umbonium sp., Venerupis siratoriensis, Vicarya callosa, Vicaryella bacula
- Suzuki et al. (2009) Jour. Geol. Soc. Japan, vol.115, Supplement, pp.139-151 DOI
- Kawai (1957) Tsuyama-Tobu, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 63p. (in Japanese with English abstract 8p.)